>>12738>>but just imagine all the entropy he can get from cows ?
We have no idea how much entropy he could get from cows because it's never specified. But I would think the answer is low:
1) QB states that the incubator's technology can convert human emotions into energy. "human" is specified. They may not have the tech to work with other living things.
2) Even if they did have it, or could develop it, there's the question as to whether or not cows even feel emotion at all—that's a massive debate well outside the scope of PMMM or this board.
3)Assuming the process was possible we have no idea what the potency of a cow's emotions are. So like you said it might be possible, but perhaps highly inefficient. Same reason why we mine gold from specific mineral deposits in the ground rather than, say, from seawater. There's gold in seawater but it's so inefficient to extract it that it's not worthwhile.
So I agree with your conclusion that efficiency is certainly a factor here (after all, we know they choose pubescent girls rather than other humans). But I don't think that "cows" is a valid example for comparison.